KR20180074853A - Vehicle, and control method for the same - Google Patents

Abstract

The present invention is to provide a vehicle and a controlling method thereof, which can limit current supplied from a high-voltage battery in order to prevent saturation of an inductor of a low-voltage DC converter. According to an embodiment of the present invention, the vehicle comprises: a first battery which outputs power of a first voltage; a second battery which outputs power of a second voltage; and a low-voltage DC converter which converts the first voltage of the first battery into the second voltage, and supplies the power of the converted second voltage to the second battery. In addition, the low-voltage DC converter comprises: a DC-DC converter which outputs the second voltage based on power supplied from the first battery; a current transformer which senses current of the power supplied from the first battery; and a control unit which limits the current of the power supplied from the first battery to below a reference current value when a peak value of a voltage in proportional to the sensed current is above a predetermined reference voltage value, and controls the DC-DC converter in order to output the second voltage by using the power of the limited current value.

Description

VEHICLE, AND CONTROL METHOD FOR THE SAME

An ADAS (Advanced Driver Assist System) module, and a control method thereof.

Generally, a vehicle means a moving means or a transportation means that travels on a road or a line using fossil fuel, electricity, or the like as a power source.

Vehicles using fossil fuels can emit fine dust, water vapor, carbon dioxide, carbon monoxide, hydrocarbons, nitrogen, nitrogen oxides, and / or sulfur oxides due to the combustion of fossil fuels. Water vapor and carbon dioxide are known to cause global warming, and fine dust, carbon monoxide, hydrocarbons, nitrogen oxides, and / or sulfur oxides are known as air pollutants that can harm people.

For this reason, vehicles using environmentally friendly energy that replace fossil fuels are being developed recently. For example, Hybrid Electric Vehicle (HEV) and Electric Vehicle (EV) that use both fossil fuel and electricity are being developed.

Hybrid cars and electric cars have separate high-voltage batteries that power the motor that drives the vehicle and low-voltage batteries that power the vehicle's electrical components. Hybrid vehicles and electric vehicles also typically include a converter that converts the voltage of a high voltage battery to a voltage of a low voltage battery to supply power from a high voltage battery to a low voltage battery.

According to an embodiment of the disclosed invention, there is provided a vehicle that limits the current supplied from a high-voltage battery to prevent saturation of the inductor of the low-voltage DC converter, and a control method thereof.

According to one embodiment, a vehicle includes: a first battery that outputs power of a first voltage; A second battery for outputting a power of a second voltage; A low voltage DC converter for converting a first voltage of the first battery to the second voltage and supplying the converted second voltage to the second battery; Wherein the low-voltage DC converter includes: a DC-DC converter that outputs the second voltage based on electric power supplied from the first battery; A current transformer for sensing a current of electric power supplied from the first battery; And limiting the current of the power supplied from the first battery to a reference current value or less if the peak value of the voltage proportional to the sensed current is equal to or greater than a predetermined reference voltage value, A controller for controlling the DC-DC converter to output a second voltage; . ≪ / RTI >

The DC-DC converter may further include: a switching unit that is switched according to pulse width modulation; And a saturation preventing circuit for limiting a current of electric power supplied from the first battery to be equal to or less than the reference current value and providing the limited current to the switching unit; . ≪ / RTI >

The control unit may operate the saturation prevention circuit when the peak value of the voltage proportional to the sensed current is equal to or greater than a predetermined reference voltage value.

In addition, the saturation prevention circuit may limit the current of the power supplied from the first battery to the reference current value or less by changing the switching frequency of the pulse width modulation.

The saturation prevention circuit may reduce a duty ratio of the pulse width modulation to limit a current of power supplied from the first battery to a value equal to or less than the reference current value.

The control unit may compare the reference voltage value, which is determined according to the current value of the saturation point of the inverter constituting the DC-DC converter, with a peak value of a voltage proportional to the sensed current.

Also, the controller may control the DC-DC converter to limit the current of the power supplied from the first battery to be less than the reference current value set to be smaller than the current value of the saturation point of the inverter constituting the DC-DC converter, Can be controlled.

The control unit may include: a differential amplifier for outputting a voltage proportional to the sensed current; A peak detector for detecting a peak value at the output voltage; And a comparator for comparing the detected peak value with the reference voltage value. . ≪ / RTI >

The low-voltage DC converter may further include: an input filter for removing noise from input power; And an output filter for removing noise from power before output; As shown in FIG.

According to an embodiment of the present invention, there is provided a control method for a vehicle, including: a first battery that outputs power of a first voltage; A second battery for outputting a power of a second voltage; A low voltage DC converter for converting a first voltage of the first battery to the second voltage and supplying the converted second voltage to the second battery; The method comprising the steps of: sensing a current of electric power supplied from the first battery to the low-voltage DC converter; Limiting a current of power supplied from the first battery to a reference current value or less if the peak value of the voltage proportional to the sensed current is equal to or greater than a predetermined reference voltage value; And outputting the second voltage using the power of the limited current value; . ≪ / RTI >

Also, the step of outputting the second voltage using the power of the limited current value may include supplying power of the limited current value to the switching unit, which is switched according to pulse width modulation, Can be output.

The step of limiting the electric current of the power supplied from the first battery to the reference current value or less may operate the saturation prevention circuit to limit the electric current of the electric power supplied from the first battery to a value lower than the reference current value have.

Also, the step of limiting the electric current of the power supplied from the first battery to the reference current value or less may change the switching frequency of the pulse width modulation by operating the saturation prevention circuit.

In addition, the step of limiting the current of the power supplied from the first battery to a reference current value or less may change the duty ratio of the pulse width modulation to change the switching frequency of the pulse width modulation .

Also, the step of limiting the electric current of the power supplied from the first battery to a reference current value or less may include comparing the reference voltage value determined based on the current value of the saturation point of the inverter constituting the low-voltage DC converter, Comparing the peak value of the voltage proportional to the peak value of the voltage; . ≪ / RTI >

The step of limiting the current of the power supplied from the first battery to a reference current value or less may further include a step of limiting the current of the first battery to the reference current value or less, The current of the power supplied from the battery can be limited.

In addition, the step of limiting the electric current of the power supplied from the first battery to the reference current value or less includes: outputting a voltage proportional to the sensed current; Detecting a peak value at the output voltage; And comparing the detected peak value with the reference voltage value; . ≪ / RTI >

Removing noise from power supplied to the low-voltage DC converter from the first battery; And removing noise from the power of the output second voltage; As shown in FIG.

According to one embodiment of the disclosed vehicle and its control method, the current supplied from the high-voltage battery is limited before the saturation of the inductor, thereby preventing the burnout of the switching part of the DC-DC converter by inductor saturation.

In addition, since saturation of the inductor is prevented in advance, shutdown due to the overcurrent does not occur, and the safety of the driver during running can be secured.

1 is a view showing a vehicle body of a vehicle according to an embodiment.
2 is a view showing an undercarriage of a vehicle according to an embodiment.
3 is a view showing electric components of a vehicle according to an embodiment.
4 is a diagram showing a power system of a vehicle according to an embodiment.
5 is a control block diagram of a low-voltage DC converter according to an embodiment.
6A and 6B are diagrams for explaining the operation of the saturation prevention circuit according to one embodiment.
7 is a flowchart of a vehicle control method according to an embodiment.

Like reference numerals refer to like elements throughout the specification. The present specification does not describe all elements of the embodiments, and redundant description between general contents or embodiments in the technical field of the present invention will be omitted. The term 'part, module, member, or block' used in the specification may be embodied in software or hardware, and a plurality of 'part, module, member, and block' may be embodied as one component, It is also possible that a single 'part, module, member, block' includes a plurality of components.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only the case directly connected but also the case where the connection is indirectly connected, and the indirect connection includes connection through the wireless communication network do.

Also, when an element is referred to as "comprising ", it means that it can include other elements, rather than exclude other elements unless specifically stated otherwise.

The terms first, second, etc. are used to distinguish one element from another, and the elements are not limited by the above terms.

The singular forms " a " include plural referents unless the context clearly dictates otherwise.

In each step, the identification code is used for convenience of explanation, and the identification code does not describe the order of the steps, and each step may be performed differently from the stated order unless clearly specified in the context. have.

Hereinafter, the working principle and embodiments of the disclosed invention will be described with reference to the accompanying drawings.

The vehicle 1 is a mechanical / electric device for transporting people and / or objects using the rotational force of the internal combustion engine and / or the rotational force of the electric motor.

The vehicle 1 using the internal combustion engine can explosively burn fossil fuels such as gasoline, light oil and gas, convert the translational force generated during the combustion of the fossil fuel into rotational force, and move using the converted rotational force.

A vehicle 1 using an electric motor is called an electric vehicle (EV), and can convert electric energy stored in a battery into rotational kinetic energy, and can move using the converted rotational force.

There is also a vehicle 1 using an internal combustion engine and an electric motor. Such a vehicle 1 is called a hybrid electric vehicle (HEV) and can be moved not only by using an internal combustion engine but also by using an electric motor. A hybrid vehicle is a general hybrid vehicle that receives only fossil fuel from the outside and generates electric energy using internal combustion engines and electric motors (generators), and a plug-in hybrid vehicle -in Hybrid Electric Vehicle (PHEV).

Electric vehicles and hybrid vehicles generally include a battery for supplying electric energy to the drive motor and a battery for supplying electric energy to the electric device (electric field, electric device) of the vehicle 1, respectively. For example, a battery that supplies electrical energy to a drive motor may have an output voltage of approximately several hundred volts (V), and a battery that supplies electrical electrical energy to electrical components may have an output strategy of approximately tens of volts.

Further, the electric vehicle charges the battery for the drive motor from the external power source, and converts the voltage of the battery for the drive motor to charge the battery for the electric component. The hybrid vehicle also uses an internal combustion engine to charge the battery for the drive motor, and converts the voltage of the battery for the drive motor to charge the battery for the electric component.

Accordingly, the electric vehicle and the hybrid vehicle may include a DC-DC converter for converting a voltage of several hundreds of volts output from the battery for the drive motor to a voltage of several tens of volts for charging the battery for the electric component.

Hereinafter, the DC-DC converter included in the vehicle 1 and the vehicle 1 will be described in detail.

1 shows a vehicle body of a vehicle according to an embodiment. Fig. 2 shows a vehicle undercarriage according to one embodiment. Fig. 3 shows electrical components of a vehicle according to an embodiment. 4 also shows a power system of a vehicle according to one embodiment.

1, 2, 3 and 4, a vehicle 1 includes a body 10 which forms an appearance of a vehicle 1 and accommodates a driver and / or a baggage, a body 10, A chassis 20 including other power generation devices, a power transmission device, a braking device, a steering device, a wheel, etc., and an electric component 30 that protects the driver and provides the driver with the convenience have.

As shown in Fig. 1, the vehicle body 20 forms an interior space in which the driver can stay, an internal combustion engine room for accommodating the internal combustion engine, and a trunk room for accommodating the cargo.

The vehicle body 20 includes a hood 21, a front fender 22, a roof panel 23, a door 24, a trunk lid 25, A quarter panel 26, and the like. A front window 27 is provided in front of the vehicle body 20 and a side window 28 is provided on a side surface of the vehicle body 20, A rear window 29 may be provided at the rear of the vehicle body 20.

2, the undercarriage 20 includes a power generation device 21, a power transmission device 22, a steering device (not shown), a steering device A braking device 23, a braking device 24, a wheel 25, and the like. The undercarriage 20 may further include a frame 26 for fixing the power generating device 21, the power transmitting device 22, the steering device 23, the braking device 24, have.

The power generation device 21 generates a rotational force for traveling the vehicle 1 and may include an internal combustion engine 21a, a fuel supply device, an exhaust device, an electric motor 21b, a first battery B1, .

The power transmitting device 22 transmits the rotational force generated by the power generating device 21 to the wheels 25 and includes a clutch / transmission 22a, a shift lever, a transmission, a differential device, a drive shaft 22b, .

The steering device 23 controls the running direction of the vehicle 1 and may include a steering wheel 23a, a steering gear 23b, a steering link 23c, and the like.

The braking device 24 stops the rotation of the wheel 25 and may include a brake pedal, a master cylinder, a brake disk 24a, a brake pad 24b, and the like.

The wheel 25 is supplied with the rotational force from the power generating device 21 through the power transmitting device 22 and can move the vehicle 1. [ The wheel 25 may include a front wheel provided at the front of the vehicle and a rear wheel provided at the rear of the vehicle.

The vehicle 1 may include various electrical components 30 for safety and convenience of the control of the vehicle 1, the driver and the passenger, as well as the mechanical components described above.

3, the vehicle 1 includes an engine management system 31, a motor control unit 32, a transmission control unit 33, An electronic braking system 34, an electric power steering 35, a navigation device 36, an audio device 37, a heating / ventilation / air conditioning (HVAC) device 38.

The electrical components 30 may communicate with each other via the vehicle communication network NT. For example, the electrical components 30 may be implemented as Ethernet, MOST (Media Oriented Systems Transport), Flexray, CAN (Controller Area Network), LIN Data can be exchanged through the network.

Also, the electric component parts 30 can be supplied with electric power from the second battery B2.

The second battery B2 may be separately provided from the first battery B1 shown in FIG.

For example, as shown in FIG. 4, the first battery B1 may supply electric power to the electric motor 21b that drives the vehicle 1 and may be supplied with several hundreds of volts (V) to supply electric power to the electric motor 21b. ) (For example, 200 V to 800 V). The second battery B2 may also supply power to the electrical components 30 and may be powered by a voltage of several tens of volts (e.g., 12V to 24V) to power the electrical components 30 Can be output. In other words, the first battery B1 and the second battery B2 may be separately provided to supply power to the electric motor 21b and the electric component 30, which are supplied with different voltages.

In addition, the first battery B1 can supply electric power to the electric motor 21b, and the first battery B1 can be charged by the electric motor 21b.

For example, while the vehicle 1 is descending the descending road, the vehicle 1 can travel by gravity and / or inertia, and the rotational force of the wheel 25 is transmitted to the electric motor 21b ). ≪ / RTI > The electric motor 21b can generate electric energy from the rotational force transmitted from the wheel 25 and the electric energy generated by the electric motor 21b can be stored in the first battery B1.

As another example, when the driver stops the vehicle 1 or decelerates the running speed of the vehicle 1, the electric motor 21b can generate a regenerative braking force for decelerating the vehicle 1 And can generate electrical energy by regenerative braking. The electric energy generated by the electric motor 21b may be stored in the first battery B1.

The first battery B1 can receive electric energy from the electric motor 21b while the second battery B2 can receive the electric energy from the first battery B1 through the low voltage DC converter 100. [ .

As described above, the voltage of the second battery B2 is different from that of the first battery B1. Therefore, a low-voltage DC converter 100 capable of converting the voltage of the first battery B1 to the voltage of the second battery B2 for charging the second battery B2 may be provided.

The low voltage DC converter 100 may convert the first voltage output from the first battery B1 to the second voltage of the second battery B2. The electric energy of the second voltage converted by the low voltage DC converter 100 may be stored in the second battery B2 and directly supplied to the electric field components 30. [

Hereinafter, the low-voltage DC converter will be described in detail with reference to Fig.

5 is a control block diagram of a low-voltage DC converter according to an embodiment.

The low-voltage DC-DC converter lowers the DC voltage of the first battery B1, which is a high-voltage battery, to reduce the DC voltage of 12V to the second battery B2, which is the auxiliary battery, Converter. The low-voltage DC converter includes a switching part composed of four MOSFETs, and it can output a desired DC voltage of 12V by alternately performing high-frequency switching by two of four MOSFETs.

In addition, the low-voltage DC converter can be provided with an inductor at the rear end of the MOSFET, and the inductor can perform storage and discharge of electric power by resonating with the parasitic capacitor of the MOSFET which is alternately switched. At this time, if the inductor is adhered poorly to the circuit board, saturation of the inductor due to the heat generation problem may occur. When the inductor is saturated, the inductance is reduced, so that an overcurrent can flow into the low-voltage DC converter, which may lead to burnout of the MOSFET.

Conventionally, in order to prevent this, a low-voltage DC converter has a circuit for detecting an overcurrent on the front of the MOSFET. This circuit can cut off the current to prevent burnout of the MOSFET when an overcurrent is detected.

However, when the voltage supplied by the auxiliary battery is insufficient to operate the electric components in the vehicle, there is no additional supply source for supplying the voltage, so that the vehicle may be shut down. If such a situation occurs during driving, the vehicle can not be operated normally and thus the safety of the driver may be threatened.

Therefore, there is a need for a low-voltage DC converter that prevents saturation of the inductor to prevent burnout of the MOSFET, and at the same time can stably supply electric power to electric components.

Referring to FIG. 5, the low-voltage DC converter according to one embodiment includes an input filter 110 for removing noise from input power; A current transformer 120 for sensing the current of the filtered input power; A DC-DC converter 140 for outputting a second voltage based on the input power; An output filter 150 for removing noise from the output power of the second voltage; And a DC-DC converter (140) for controlling the DC-DC converter (140) so as to limit a current provided to the DC-DC converter (140) when the inductor is saturated in the DC-DC converter (140) . ≪ / RTI >

The input filter 110 and the output filter 150 may remove noise from an input signal, i.e., power. For this purpose, the input filter 110 and the output filter 150 may be implemented as EMI filters. EMI filters can filter electromagnetic interference, so low-voltage DC converters can increase output efficiency through filtering.

The current transformer (CT) 120 can measure the input current by modifying the input current into a small current. Specifically, the current transformer 120 can detect the current of the power supplied from the first battery B1 filtered through the input filter 110 by modifying the current.

The DC-DC converter 140 can output the second voltage based on the detected electric power of the current. Specifically, the DC-DC converter 140 includes a switching unit 142 implemented by a Phase Shifted-Full Bridge (PSFB); And the switching unit 142 may be controlled by pulse width modulation to output the second voltage based on the input power.

Also, the DC-DC converter 140 includes a saturation prevention circuit 141 for limiting the current of the input power input to the switching unit 142 to a reference current value or less; As shown in FIG. Here, the reference current value is a maximum current value for preventing saturation of the inductor, and may be set to be smaller than the saturation current of the inductor provided at the output of the switching unit 142. [

When it is determined that the inductor is saturated, the saturation prevention circuit 141 can be operated under the control of the control unit 130, which will be described later.

The controller 130 determines whether the inductor is saturated or not, and controls the saturation prevention circuit 141 based on the determination. To this end, the control unit 130 includes a differential amplifier 131 for outputting a voltage proportional to the current sensed by the current transformer 120; A peak detector 132 for detecting a peak value from the output voltage; A comparator 133 for comparing the detected peak value with a reference voltage value; . ≪ / RTI >

The differential amplifier 131 may generate an input voltage from the current sensed by the current transformer 120 through a resistor and amplify the input voltage to generate an output voltage. Since the output voltage outputted at this time may be proportional to the current sensed by the current transformer 120, the current waveform sensed by the current transformer 120 and the output voltage waveform output by the differential amplifier 131 have the same form Lt; / RTI >

The peak detector 132 can output a peak value of one cycle from the output voltage value of the differential amplifier 131. [ As a result, the peak detector 132 can generate a constant DC voltage value for comparison with the reference voltage value in the comparator 133, which will be described later.

The comparator 133 may compare the peak value detected by the peak detector 132 with a predetermined reference voltage value. Here, the reference voltage value may be determined according to the peak value detected by the differential amplifier 131 when the current value of the inductor is saturated, but may be set by the user with reference to the peak value.

As a result of the comparison, when the peak value is smaller than the reference voltage value, the comparator 133 outputs 0 V, thereby preventing the saturation prevention circuit 141 from operating. On the other hand, if the comparison result shows that the peak value is larger than the reference voltage value, the comparator 133 can transmit the trigger signal to the saturation prevention circuit 141. [

The saturation prevention circuit 141 receiving the trigger signal can operate to limit the current input to the DC-DC converter 140 to a value below the reference current value. This will be described in detail with reference to FIGS. 6A and 6B.

6A and 6B are diagrams for explaining the operation of the saturation prevention circuit according to one embodiment.

When the saturation prevention circuit 141 does not operate, the current waveform as shown in Fig. 6A can be outputted. Referring to FIG. 6A, it can be confirmed that the current in the steady state in which the inductor is not saturated is less than the reference current value, which is the current limit reference. However, when the inductor is saturated, the inductance of the inductor is reduced, so that the slope of the current waveform can be increased. As a result, the current may exceed the reference current value, which is the current limit reference, and is problematic.

Therefore, the saturation prevention circuit 141 can limit the peak value of the input current. Specifically, the saturation prevention circuit 141 can limit the peak value of the input current by changing the switching frequency of the switching section 142. [ Referring to FIG. 6B, the saturation prevention circuit 141 may change the switching frequency so as to reduce the duty ratio, which is the ON / OFF ratio of each of the MOSFETs constituting the switching unit 142. As a result, the section in which the current rises is reduced, and the peak current value can be limited to be equal to or less than the reference current value, which is the current limit reference.

Accordingly, the low-voltage DC converter according to the disclosed embodiment prevents saturation of the inductor in advance, thereby preventing burnout of the MOSFET, and at the same time, supplying power to the electric components with stability.

7 is a flowchart of a vehicle control method according to an embodiment.

First, the vehicle can sense the current output by the first battery Bl. (810) Specifically, the vehicle's current transformer 120 is supplied from the first battery B1 filtered by the input filter 110 The current of the power can be detected.

The vehicle then amplifies the sensed current to obtain a voltage proportional to the current. (820) Specifically, the vehicle differential amplifier 131 generates an input voltage from the sensed current through a resistor, It is possible to amplify it to obtain an output voltage. The waveform of the output voltage thus obtained may be the same as the waveform of the current sensed by the current transformer 120.

When the output voltage is obtained by the differential amplifier 131, the vehicle can detect the peak value of the obtained voltage through the peak detector 132. (830) The vehicle's comparator 133 then compares the detected peak value (840) Here, the reference voltage value may be a reference value for checking whether the inductor in the DC-DC converter 140 of the vehicle is saturated. If the detected peak value is less than the reference voltage value, the procedure is terminated.

On the other hand, if the detected peak value is equal to or greater than the reference voltage value, the vehicle can limit the current output from the first battery B1 to a reference current value or less and output the second voltage using the limited current. (850)

As a result, saturation of the inductor is prevented, thereby preventing the MOSFET from being burned, and at the same time, it is possible to stably supply electric power to the electric components.

1: vehicle
100: Low-voltage DC converter
110: input filter
120: Current transformer
130:
140: DC to DC converter
141: Saturation prevention circuit
142:
150: Output filter

Claims (18)

A first battery for outputting power of a first voltage;
A second battery for outputting a power of a second voltage; And
A low voltage DC converter that converts the first voltage of the first battery to the second voltage and supplies the converted second voltage to the second battery; Lt; / RTI >
The low-voltage DC converter includes:
A DC-DC converter for outputting the second voltage based on electric power supplied from the first battery;
A current transformer for sensing a current of electric power supplied from the first battery; And
Wherein the control unit limits the current of the power supplied from the first battery to a reference current value or less when the peak value of the voltage proportional to the sensed current is equal to or greater than a predetermined reference voltage value, A DC / DC converter for controlling the DC / DC converter to output a second voltage; ≪ / RTI > The method according to claim 1,
The DC-DC converter includes:
A switching unit which is switched according to pulse width modulation; And
A saturation preventing circuit for limiting the electric current of the electric power supplied from the first battery to the reference current value or less and for providing the limited current to the switching unit; ≪ / RTI > 3. The method of claim 2,
Wherein,
And the peak value of the voltage proportional to the sensed current is equal to or greater than a predetermined reference voltage value. 3. The method of claim 2,
The anti-saturation circuit comprises:
Wherein the switching frequency of the pulse width modulation is changed to limit the electric current of the electric power supplied from the first battery to the reference electric current value or less. 5. The method of claim 4,
The anti-saturation circuit comprises:
Wherein a duty ratio of the pulse width modulation is reduced to limit a current of electric power supplied from the first battery to be equal to or less than the reference current value. The method according to claim 1,
Wherein,
And comparing the peak value of the voltage proportional to the sensed current with the reference voltage value determined according to the current value at the saturation point of the inverter constituting the DC-DC converter. The method according to claim 1,
Wherein,
Wherein the DC-DC converter controls the DC-DC converter to limit a current of power supplied from the first battery below the reference current value that is set to be smaller than the current value at the saturation point of the inverter constituting the DC-DC converter. The method according to claim 1,
Wherein,
A differential amplifier for outputting a voltage proportional to the sensed current;
A peak detector for detecting a peak value at the output voltage; And
A comparator for comparing the detected peak value with the reference voltage value; ≪ / RTI > The method according to claim 1,
The low-voltage DC converter includes:
An input filter for removing noise from the input power; And
An output filter for removing noise from power before output; . ≪ / RTI > A first battery for outputting power of a first voltage; A second battery for outputting a power of a second voltage; A low voltage DC converter for converting a first voltage of the first battery to the second voltage and supplying the converted second voltage to the second battery; A method for controlling a vehicle,
Sensing a current of power supplied from the first battery to the low voltage DC converter;
Limiting a current of power supplied from the first battery to a reference current value or less if the peak value of the voltage proportional to the sensed current is equal to or greater than a predetermined reference voltage value; And
Outputting the second voltage using the power of the limited current value; And controlling the vehicle. 11. The method of claim 10,
Wherein the step of outputting the second voltage using the power of the limited current value comprises:
And supplying power of the limited current value to a switching unit switched according to pulse width modulation to output the second voltage. 12. The method of claim 11,
Wherein the step of limiting the electric current of the electric power supplied from the first battery to be equal to or less than the reference current value,
And the saturation prevention circuit is operated to limit a current of electric power supplied from the first battery to a value equal to or lower than a reference current value. 13. The method of claim 12,
Wherein the step of limiting the electric current of the electric power supplied from the first battery to be equal to or less than the reference current value,
And the saturation prevention circuit is operated to change the switching frequency of the pulse width modulation. 14. The method of claim 13,
Wherein the step of limiting the electric current of the electric power supplied from the first battery to be equal to or less than the reference current value,
Wherein the duty ratio of the pulse width modulation is reduced to change the switching frequency of the pulse width modulation. 11. The method of claim 10,
Wherein the step of limiting the electric current of the electric power supplied from the first battery to be equal to or less than the reference current value,
Comparing the reference voltage value, which is determined according to a current value at a saturation point of the inverter constituting the low-voltage DC converter, with a peak value of a voltage proportional to the sensed current; And controlling the vehicle. 11. The method of claim 10,
Wherein the step of limiting the electric current of the electric power supplied from the first battery to be equal to or less than the reference current value,
Wherein the current of the power supplied from the first battery is less than the reference current value set to be smaller than the current value of the saturation point of the inverter constituting the low voltage DC converter. 11. The method of claim 10,
Wherein the step of limiting the electric current of the electric power supplied from the first battery to be equal to or less than the reference current value,
Outputting a voltage proportional to the sensed current;
Detecting a peak value at the output voltage; And
Comparing the detected peak value with the reference voltage value; And controlling the vehicle. 11. The method of claim 10,
Removing noise from power supplied to the low-voltage DC converter from the first battery; And
Removing noise from the output power of the second voltage; Further comprising the steps of:

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